--------------------------------------------------------------
There is a "bug" on screen in general, about the termcap
entries on terminal with 256 colors (`$TERM too long`).
I checked the source code and the string length '20' is hard
coded somehow, so it cannot support 'rxvt-unicode-256color'
(just 21 chars ).
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On one system, I tried to hack the termcaps (copied via
`infocmp` the old rxvt-unicode-256color' into a custom
'urxvt-256color', edit the /etc/termcap file, the terminfo
files for screen...) but not success.
Then I made the test of change those '20' values and worked
(supports my custom $TERM with 256 colors, non custom ones
too), no problems on color part, although it crashed several
times...
Luckily, found a patch somewhere that does the same I tried,
but better... As far as I know, it works fine.

TO COMPILE

Here will find the patched sources (vpatch + long $TERM names patch applied and already on the source).
Here and here will find both patches. To apply, extract source code, `cd` into that dir and run:

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